Improved mode of operating giffard s injector



UNITED STATES PATENT OFFICE.

JAMES MILLHOLLAND, OF READING, PENNSYLVANIA.

IMPROVED MODE OF OPERATING GIFFARDS INJECTOR.

Specification forming part of Letters Patent No. 33,957, dated December1'7, 1861.

To all whom it may concern:

Be it known that I, J AMESl MTLLHOLLAND, of Reading, Berks county,Pennsylvania, have invented a new and Improved Mode of OperatingGiffards Injector; and I do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention consists in operating the perforated tube and internal rodof a Giffard inj ector by levers arranged substantially as explainedhereinafter, the said levers being provided with the applianceshereinafter described or their equivalents, so that they can be operatedtogether or independently of each other.

My invention has for its object the placing of the injector in such aposition on a locomotive that the supply of Water to the instrument fromthe tank will depend upon the direct flow of water fronrthe same, andnot upon the aspiration of the instrument itself, as usual, the leversat the same time affording the engineer every facility for readilyoperating the moving parts of the injector.

In order to enable others to make and use my invention, I will nowproceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of thisspecification, Figure l is a sectional view of Giifards injector with myimproved arrangement of levers for operating the same, and Fig. 2 is anend view.

A is the body of a Giffard injector, the general construction of whichis too familiar to engineers to need minute description. B is the pipethrough which the steam from the boiler is admitted to the injector. Gisthe feed-pipe; H, the overfiow-pipe; I, the pipe through which thewater is forced into the boiler, and J the check-valve, K being theperforated conicalended tube for regulating the supply of Water admittedto the injector, and L the internal rod for regulating the jet of steam.The outer end of the perforated tube K is furnished with a collar, a,into the groove of which fit pins projecting from the forked end of thelever M, the latter having its fulcrum on a pin, fm, secured in asuitable position to the outside of the lirebox of the locomotive. Theinternal rod, L, is

provided with a collar, b, into the groove of which fit pins projectingfrom the forked end of the lever N, which has its f ulcrum on a pin, n,secured to the side of the tire-box. The two levers M and N are soarranged as to be adjacent to each other, and are of such a length as tobe within reach of the engineer on the platform of the locomotive.

To the upper end of the lever M is jointed a rod, P,Which is arranged topass freely through a permanent staple, Q, the latter being providedwith a set-screw, d, by means of which the rod P, and consequently thelevers M and N, may be secured after adjustment.

To the upper end of the lever N is jointed a rod, R, through alongitudinal slot in which passes a screw on the lever M, this screwbeing provided With a nut, t, on loosening which the levers may beoperated independently of each other. On tightening the nut, however,the levers must move together.

Prior to starting the injector to work the levers M and N areVdisconnected from each other, andthe set-screw d of the staple Qloosened. The lever M is then so moved as to partially withdraw theperforated tube K from the body of the injector, thereby allowing thewater from the pipe G to flow into the instrument. The internal rod, L,is now moved outward by means of the lever N, thereby allowing the steamto pass through the perforated tube K into the instrument, and to forcethe water through the pipe G into the boiler in the manner Well known tothose familiar with Giffards injectors. The perforated tube K andinternal rod, L, having been adjusted to the desired position, the nutsCZ and tare tightened, thereby connecting the two levers M and Ntogether and securing both in the position to which they have beenadjusted.

When the engineer desires to arrest the action of the injector, heloosens the set-screw d and moves the levers M and N simultaneously,thereby operating the perforated tube K and internal rod, L, at the sametime. It will be evident that a simultaneous movement of the two leversby the engineer will restore the action of the injector.

In operating the perforated tube and internal rod for producing theabove results it is necessary that the rod should be moved a greaterdistance than the tube. At the same time it is desirable that the upperends or handles of the two levers should remain connected together andmove simultaneously; hence the arm of the lever IWI is longer than thatof the lever N.

It has been usual hitherto to operate the perforated tubes and internalrods of injectors by screws, and to place the injectors themselves insuch an elevated position on the tirebox of the locomotive that theseoperatingserews may be within reach of the engineer, Owing` to thiselevated position of the injectors they are generally below the level ofthe feed-Water in the tank, so that the supply of water must be obtainedby the aspiration of the instrument itself, which is well known to beobjectionable.

By employing` the levers M and N for operating` the perforated tube andinternal rod of the injector, the latter may be secured so low downenthe fire-box of the locomotive that the water will Iiow directly fromthe tank into the instrument; at the same time the levers present themost efficient means of rapidly manipulating the instrument.

In some locomotives it may be advisable to place the injector in avertical or angular position, in which case bell-crank or curved leversmay be substituted for the straight levers M and N.

I claim as my invention and desire to secure by Letters Patent-Operating the perforated tube and internal rod of a Giffard injector bylevers IWI and N, arranged substantially as described7 the said leversbeing provided with the appliances herein described or theirequivalents, so that they can be operated together orindependently ofeach other, as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing` witnesses.

JAMES MILLHOLLAND.

